[Libraries] [Collections] [Backend] Collections model in Learning Core

[bradenmacdonald]

Define new Collection Model with the following fields in a new collections app in the openedx_learning repo:

• id: models.AutoField(primary_key=True)
• context: ForeignKey to the LearningPackage (which is a 1-to-1 with ContentLibrary) instance this collection belongs to
  • name
  • description
  • date_created
  • date_updated
  • enabled
  • allow_multiple
  • ... possibly other fields - see collections design in Figma

Create a python API for CRUD operations on these collection objects, and appropriate test cases.

[rpenido]

Hi @bradenmacdonald! CC @pomegranited

Do you think this should live in openedx-learning?
If this is the case, the context should be just a string field (with no validation) with the key to the library, as we don't have OpaqueKey or other entities from edx-platform here, right?
My bad! I just found the LearningPackage entity in openedx-learning.